Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1982-06-28
1984-11-27
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
H02J 100
Patent
active
044854234
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a control equipment power source for supplying power to control equipment, such as numerical control equipment.
In general, control equipment, such as numerical control equipment, contains a memory circuit, an I/O interface circuit and so forth in addition to a control circuit, such as a processor. In the case where the control circuit and the I/O interface circuit and so on operate on different drive voltages, a control equipment power source arrangement is required that provides a power source for supplying electric power necessary for operating the control circuit (which power source will hereinafter be referred to as the control circuit power source) and a power source for supplying electric power necessary for driving the memory circuit for its read/write operations and for driving the I/O interface circuit (which power source will hereinafter be referred to as the driving power source).
Further, in this kind of control equipment,
1. Various check functions for preventing malfunction are included corresponding to the controlled systems but, in many cases, these check functions are not assured in the case of an abnormality in the power source system;
2. It is desired that stored contents of various memory circuits be retained at the time of the power source being ON and OFF; and
3. It is desired that no unnecessary signals be sent from the interface circuit to a controlled system, for instance, a machine tool in a transient state at the time of the ON-OFF operation of the power source. is required to have the following functions:
(1) A function of detecting power source abnormalities and cutting off the power source for preventing malfunctions resulting therefrom;
(2) maintenance of a power down sequence for preventing malfunctions at the time of the ON-OFF operation of the power source; and
(3) a function of quickly providing power source OFF information to the control equipment to stop, for example, the read/write operation of the memory circuit.
To achieve such functions as mentioned above, according to the prior art, for example, as shown in FIG. 1, a control equipment power source 102 having a control circuit power source 100 and a driving power source 101 is provided with a control circuit power source abnormality detecting circuit (hereinafter referred to as the EC power source abnormality detecting circuit) 103 for detecting abnormalities in the control circuit power source 100 and a driving power source abnormality detecting circuit (hereinafter referred to as the ED power source abnormality detecting circuit) 104 for detecting abnormalities in the driving power source 101, and outputs from the both detecting circuits are processed to perform a power down sequence such, for instance, as shown in FIG. 2, thereby performing the above-mentioned functions (1) and (3).
That is, when a power source switch 105 is turned ON to connect an AC power source 106 to the control equipment power source 102, an output Ec from the control circuit equipment power source 100 is caused to rise first and then, at the moment when the output Ec reaches its steady state, an output Ed from the driving power source 101 is caused to rise. At the moment when the outputs Ec and Ed both reach the steady state, an enable signal EN, which informs control equipment 107 of the presence or absence of a power source abnormality, is turned ON, thereby preventing malfunction of the control equipment 107 and a controlled system 108. When a power source abnormality is detected by the detecting circuits 103 and 104, the enable signal EN is immediately turned OFF and, after a predetermined period of time, the driving power source 101 is forcibly turned OFF and the power source switch 105 is turned OFF by a switch control signal or an alarm signal ALM, by which the driving power source output Ed is completely turned OFF before the output Ec from the control circuit power source 100 becomes unstable as shown in FIG. 2, thus preventing malfunction. Further, since the enable sig
Hattori Masayuki
Nakamura Shigeo
Fujitsu Fanuc Limited
Moose Jr. Harry E.
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